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ROHN Heavy Duty Thrust Bearings
ROHN Heavy Duty Thrust Bearings are designed to attach to an accessory shelf at the top of a tower and to antenna support masts that are intended to be rotated, for directional antenna systems used in various radio applications.

The TB-3 is used for masts up to 2 in. OD (outside diameter) and the TB-4 is used for masts up to 3 in. OD.

The ROHN Thrust Bearings are mounted with supplied 1/2 in. x 1-1/2 in. Grade 5 galvanized steel bolts, through four 0.563 in. holes, equally spaced, on a pattern that is 5.375 in. diameter, concentric with the mast opening.

Made from high strength aluminum castings and assembled with stainless steel ball bearings, ROHN Thrust Bearings mount directly to the pre-drilled ROHN "Flat-Top" Tower Section models 25AG4 and 45AG4. These Thrust Bearings are also used on Bearing Plate models BPL25G, BPL45G, or BPL55G which may be added to straight 25G, 45G or 55G Tower Sections, respectively. They may are also be used on the combination model BAS25G Bearing Accessory Shelf for straight 25G Tower Sections.